![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
PHPzCorrection status：qualified
Teacher's comments：写的不错
Collection
Collection
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title> 实例演示dom增删改的常用方法</title></head><body><ul class="list"><li class="item">item</li><li class="item">item</li><li class="item">item</li><li class="item">item</li><li class="item">item</li><li class="item">item</li></ul><ul class="xz"></ul><ul class="sc"><li class="item">删除1</li><li class="item">删除2</li><li class="item">删除3</li><li class="item">删除4</li><li class="item">删除5</li><li class="item">删除6</li></ul><ul class="xg"><li class="item">修改1</li><li class="item">修改2</li><li class="item">修改3</li><li class="item">修改4</li><li class="item">修改5</li><li class="item">修改6</li></ul><script>const xz= document.querySelector(".xz");console.log(xz);const li ='<li>新增</li>'xz.insertAdjacentHTML('afterbegin',li);const ul = document.querySelector('.sc');// 删除ul.firstElementChild.remove();ul.querySelector('li:nth-of-type(3)').remove();ul.querySelector('li:nth-of-type(4)').remove();//修改const xg = document.querySelector('.xg');console.log(xg);const bxgNode = xg.querySelector("li:nth-of-type(3)");console.log(bxgNode);const nr = document.createElement('span')nr.append("我被修改了!!");xg.replaceChild(nr, bxgNode);</script></body></html>
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>留言板案例, 添加自定义样式</title></head><body><input type="text" onkeydown="addMsg(this)" placeholder="请输入留言" autofocus /><ul class="list"></ul><script>function addMsg(ele){if (event.key === 'Enter') {// 1. 判断留言不能为空if (ele.value.length === 0) {alert('留言不能为空');// 重置焦点到输入框中ele.focus();return false;}// 2. 添加留言const ul = document.querySelector('.list');ele.value = ele.value + ' <a onclick="del(this.parentNode)">删除x</a>';ul.insertAdjacentHTML('afterbegin', `<li>${ele.value}</li>`);// 查询找到当前a标签const a = document.querySelector(".list a");// 添加a标签鼠标样式a.style.cursor ="pointer";//增加a标签字体颜色a.style.color = 'red';// 增加a标签1px的边框a.style.border= '1px solid';// 3. 清空输入框ele.value = null;}}// 删除功能function del(ele) {if (confirm('是否删除?')) {ele.remove();}}</script></body></html>
